This article is about a non-canonical topic in the Metal Gear series.

Dr. Lucinda Koppelthorn was a scientist who supervised the creation of SaintLogic's Model 3 test subjects, and was the wife of Thomas Koppelthorn. She was killed during the Praulia Massacre, leaving behind a record of what actually occurred during the incident, which later became known as the "Lucinda File." The mercenary Snake was accused by Thomas Koppelthorn of having murdered his wife, when, in reality, Lucinda actually wished to kill herself for performing extensive experiments on the subjects (which usually destroyed their body and sometimes their mind).

Thomas Koppelthorn later attempted to revive his deceased wife by implanting her memories into a young girl named Lucy.

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